Quantitative Aptitude - Arithmetic Ability Questions

The variance of a set of data is 121. Then the standard deviation of the data is

Find the odd word/letters/number pair from the given alternatives.

What is the equation of the line passing through the point (0,­4) and making an angle of ­45° with the positive x­axis?

The age of A is three times the age of B. What is the ratio of the age of B to the age of A?

Two pipes, when working one at a time can fill a cistern in 2 hrs and 3 hrs, respectively while a third pipe can drain the cistern empty in 6 hrs. All the three pipes were opened together when the cistern was 1/6 full. How long will it take for the cistern to be completely full?

In ΔPQR, PQ = PR = 18 cm, AB and AC are parallel to lines PR and PQ respectively. If A is the mid-point of QR, then what is the perimeter (in cm) of quadrilateral ABPC?

Which of the following condition is sufficient to state that triangle ABC and DEF are similar?

A cylindrical vessel of radius 8 cm is partially filled with water. By how much will the water level rise if a sphere of radius 7 cm is completely immersed in this water?